EP 0025253 A1 19810318 - Optical recording disk.
Title (en)
Optical recording disk.
Title (de)
Optische Aufzeichnungsplatte.
Title (fr)
Disque d'enregistrement optique.
Publication
Application
Priority
NL 7906728 A 19790910
Abstract (en)
Optical recording disk which comprises a disk-shaped substrate plate which on at least one side has an amorphous recording layer, in which the substrate on the side of the recording layer comprises surface discontinuities having diametrical dimensions from 30-300 nm and a level difference with the substrate surface from 8 to 80 nm and in which the recording layer has a maximum thickness of 50 nm. By exposure to laser light modulated in accordance with the information, very small holes (bits) can be formed in the recording layer while using small amounts of laser light energy. For example, the surface of the substrate is roughened or provided with scratches. The substrate may also have a separate coating layer comprising the discontinuities, for example, an inhomogeneous vapour-deposited layer, a coarse granular layer of a dye or a light-cured lacquer layer which is roughened or provided with scratches.
IPC 1-7
IPC 8 full level
B41M 5/26 (2006.01); B41M 5/24 (2006.01); G11B 7/24 (2006.01); G11B 7/241 (2006.01); G11B 7/253 (2013.01); G11B 7/243 (2013.01); G11B 7/257 (2006.01)
CPC (source: EP US)
G11B 7/241 (2013.01 - EP US); G11B 7/253 (2013.01 - EP US); G11B 7/2531 (2013.01 - EP US); G11B 7/2533 (2013.01 - EP US); G11B 7/2575 (2013.01 - EP US); G11B 2007/24314 (2013.01 - EP US); G11B 2007/24316 (2013.01 - EP US); Y10S 430/146 (2013.01 - EP US); Y10S 430/165 (2013.01 - EP US)
Citation (search report)
- US 4032691 A 19770628 - KIDO KEISHIRO, et al
- DE 2203861 A1 19720817
- DE 2826122 A1 19781221 - FUJI PHOTO FILM CO LTD
- [E] EP 0017289 A1 19801015 - PHILIPS NV [NL]
- [P] EP 0013453 A1 19800723 - PHILIPS NV [NL]
- [A] DE 2632122 A1 19770120 - HITACHI LTD
- [A] DE 2439848 A1 19750306 - CANON KK
- PATENT ABSTRACTS OF JAPAN, vol. 2, no. 23, 15-02-1978, page 11671 E-77, & JP-A-52 143 838 (RICOH K.K.) (30-11-1977)
- "LASER IN DER PRAXIS OPTISCHER SPEICHER MIT DIODENLASER ZEICHNET 1010 BIT AUF EINER 30-ZENTIMETER-PLATTE AUF DIODE LASER RECORDER GIVES 1010 USER BITS PER 12" DISK", LASER + ELEKTRO-OPTIK., AT-FACHVERLAG. STUTTGART., DE, no. 01, 1 January 1979 (1979-01-01), DE, pages 14 - 16, XP002941255
Designated contracting state (EPC)
AT BE CH DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0025253 A1 19810318; EP 0025253 B1 19840201; AT E6102 T1 19840215; AU 538380 B2 19840809; AU 6211980 A 19810319; CA 1150410 A 19830719; DE 3066402 D1 19840308; DK 150834 B 19870629; DK 150834 C 19880201; DK 382080 A 19810311; ES 494877 A0 19811201; ES 8201339 A1 19811201; HK 57386 A 19860815; JP H0341904 B2 19910625; JP S5740766 A 19820306; NL 7906728 A 19810312; SG 2285 G 19850614; US 4318112 A 19820302
DOCDB simple family (application)
EP 80200833 A 19800905; AT 80200833 T 19800905; AU 6211980 A 19800908; CA 359517 A 19800904; DE 3066402 T 19800905; DK 382080 A 19800908; ES 494877 A 19800908; HK 57386 A 19860807; JP 12412680 A 19800909; NL 7906728 A 19790910; SG 2285 A 19850108; US 9843679 A 19791129